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    <title>Bootstrap 框架练习</title>
    <style>
        .container div {
            border: 1px red solid;
            margin-bottom: 10px;
        }

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<body>
    <!-- <div class="container">
        <h1>Bootstrap 框架练习</h1>
    </div>
    <div class="container-fluid">
        <h1>Bootstrap 框架练习</h1>
    </div>
    <div class="container">
        <div class="row">
            <div class="col">
                One of three columns
            </div>
            <div class="col">
                One of three columns
            </div>
            <div class="col">
                One of three columns
            </div>
            <div class="col">
                One of three columns
            </div>
        </div>
    </div>
    <div class="container">
        <div class="row">
            <div class="col-sm">
                One of three columns
            </div>
            <div class="col-sm">
                One of three columns
            </div>
            <div class="col-sm">
                One of three columns
            </div>
        </div>
    </div>
    <div class="container">
        <div class="row">
            <div class="col">
                1 of 3
            </div>
            <div class="col-8">
                2 of 3 (wider)
            </div>
            <div class="col">
                3 of 3
            </div>

        </div>
        <div class="row">
            <div class="col-sm-8">col-sm-8</div>
            <div class="col-sm-4">col-sm-4</div>
        </div>
        <div class="row">
            <div class="col-md-4">.col-md-4</div>
            <div class="col-md-4 ml-auto">.col-md-4 .ml-auto</div>
        </div> 

    </div>-->
    <nav class="navbar navbar-expand-lg navbar-light bg-light" style="background-color: #094a79;">
        <a class="navbar-brand" href="#">XXX 有限责任公司</a>
        <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent"
            aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
            <span class="navbar-toggler-icon"></span>
        </button>

        <div class="collapse navbar-collapse" id="navbarSupportedContent">
            <ul class="navbar-nav mr-auto">
                <li class="nav-item active">
                    <a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
                </li>
                <li class="nav-item">
                    <a class="nav-link" href="#">Link</a>
                </li>
                <li class="nav-item dropdown">
                    <a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button"
                        data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
                        Dropdown
                    </a>
                    <div class="dropdown-menu" aria-labelledby="navbarDropdown">
                        <a class="dropdown-item" href="#">Action</a>
                        <a class="dropdown-item" href="#">Another action</a>
                        <div class="dropdown-divider"></div>
                        <a class="dropdown-item" href="#">Something else here</a>
                    </div>
                </li>
                <li class="nav-item">
                    <a class="nav-link disabled" href="#" tabindex="-1" aria-disabled="true">Disabled</a>
                </li>
            </ul>
            <form class="form-inline my-2 my-lg-0">
                <input class="form-control mr-sm-2" type="search" placeholder="Search" aria-label="Search">
                <button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
            </form>
        </div>
    </nav>
    <div id="carouselExampleIndicators" class="carousel slide" data-ride="carousel">
        <ol class="carousel-indicators">
            <li data-target="#carouselExampleIndicators" data-slide-to="0" class="active"></li>
            <li data-target="#carouselExampleIndicators" data-slide-to="1"></li>
            <li data-target="#carouselExampleIndicators" data-slide-to="2"></li>
        </ol>
        <div class="carousel-inner">
            <div class="carousel-item active">
                <img src="http://getbootstrap.com/docs/4.3/assets/brand/bootstrap-social.png" class="d-block w-100"
                    alt="...">
            </div>
            <div class="carousel-item">
                <img src="..." class="d-block w-100" alt="...">
            </div>
            <div class="carousel-item">
                <img src="..." class="d-block w-100" alt="...">
            </div>
        </div>
        <a class="carousel-control-prev" href="#carouselExampleIndicators" role="button" data-slide="prev">
            <span class="carousel-control-prev-icon" aria-hidden="true"></span>
            <span class="sr-only">Previous</span>
        </a>
        <a class="carousel-control-next" href="#carouselExampleIndicators" role="button" data-slide="next">
            <span class="carousel-control-next-icon" aria-hidden="true"></span>
            <span class="sr-only">Next</span>
        </a>
    </div>
    <div class="container">

        <section>
            <h2>排版</h2>
            <h3>
                Fancy display heading
                <small class="text-muted">With faded secondary text</small>
            </h3>
            <blockquote class="blockquote">
                <p class="mb-0">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer posuere erat a ante.
                </p>
                <footer class="blockquote-footer">Someone famous in <cite title="Source Title">Source Title</cite>
                </footer>
            </blockquote>
            <p>
                <img class="img-fluid" src="http://getbootstrap.com/docs/4.3/assets/brand/bootstrap-social.png"
                    alt="bootstrap 4">
            </p>
            <nav aria-label="breadcrumb">
                <ol class="breadcrumb">
                    <li class="breadcrumb-item"><a href="#">Home</a></li>
                    <li class="breadcrumb-item"><a href="#">Library</a></li>
                    <li class="breadcrumb-item active" aria-current="page">Data</li>
                </ol>
            </nav>
            <button type="button" class="btn btn-success">Success</button>
            <div class="card" style="width: 18rem;">
                <img src="http://getbootstrap.com/docs/4.3/assets/brand/bootstrap-social.png" class="card-img-top"
                    alt="...">
                <div class="card-body">
                    <p class="card-text">Some quick example text to build on the card title and make up the bulk of the
                        card's content.</p>
                </div>
            </div>
        </section>

    </div>
    <!-- Optional JavaScript -->
    <!-- jQuery first, then Popper.js, then Bootstrap JS -->
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